When plugging in your webcam and headet or speakers at the same time, you may receive a very loud high-pitched feedback loop.  This is because you plugged in two microphone plugs (often pink in color.) 

The fastest way to fix this problem is to simply leave the pink microphone plug with your webcam UNPLUGGED and use the pink mic plug from your headset instead.  Your headset's mic will pick up sound and transfer it at the same time as your webcam. 

For a more permanent fix, you should change your computer's settings so your headet/speakers do not play sounds picked up from your microphone.

1. Double-click the Volume icon on the Taskbar (it looks like a grey, conical speaker)  to open the Volume Control Settings window.
   Note: If you do not see the volume icon on the Taskbar:

   1. Click Start
   2. Choose Control Panel
   3. Click Sounds and Audio Devices
   4. On the volume tab, place a check mark beside "Place volume icon in the Taskbar."  If your computer says "No Audio Device Installed," see troubleshooting, below.
   5. Click Apply, and then click OK. The Volume icon appears in the Taskbar.
      
      
2. Click "Mute" under the "Microphone" slider - this will keep sounds from your microphone from feeding back into your headset or speakers.
   
   
3. Select the Options menu and click Properties
   
   
4. In "Adjust volume for," click the Recording radio (circular) button
   
   
5. In "Show the following volume controls," place a check in the Microphone check box.
   
   
6. Click OK
   
   
7. Adjust the volume for Microphone. If the volume is now acceptable, proceed directly to step 11.
   Note: If you do not see the Advanced button, select Options from the Recording Control window, and then click Advanced Controls.
   
   
8. To make finer adjustments to the sound, click the Advanced button, and then select the (Microphone) 1 Mic Boost check box.
   
   
9. Click Close
   
   
10. Repeat step 7 if needed
    
    
11. Click the X at the upper-right corner of the Volume Control window to close.